我不知道这些书该放在哪个书架上。
I don't know which shelf these books belong on.
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on英 /ɒn/|美 /ɑn/
解释
(on) 滞留在间接疑问句末尾。wh-词 which shelf 是介词 on 的补足语，因疑问移位被提前，on 留在从句末尾。
I don't know which shelf these books belong on.
(on) 滞留在间接疑问句末尾。wh-词 which shelf 是介词 on 的补足语，因疑问移位被提前，on 留在从句末尾。